We treat as Gaussian constraints all electroweak precision observables, all \(B\) -physics and \(K\) -physics
observables except for \({\rm BR}(B_{s, d} \rightarrow \mu ^+\mu ^-)\) .
The \(\chi ^2\)  contribution from \({\rm BR}(B_{s, d} \rightarrow \mu ^+\mu ^-)\) , combined here in the quantity
\(R_{\mu \mu }\)  [1]}, is calculated using a combination of the
CMS [2]} and LHCb [3]} results described
in [4]} with the more recent result from ATLAS [5]}.
The corresponding \(\chi ^2\)  contribution is labelled as “2D likelihood” in
Table REF .
We calculate the elements of the CKM matrix using only experimental
observables that are not included in our set of flavour constraints.
